Fire-tube boiler



July 3,1928. 1,675,724

J. PETTY FIRE TUBE BOILER Filed Bed. 26. 1922 x w- Q52; 0

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Patented July 3, 1928.

1,615.12; PATE T orrica;

JOHN PETTY, ormsanon, PENNSYLVANIA, Assmizoa T0 .10 rm..mc., or mime,

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FIRE-TUBE BOILER.

' Application filed December 28, 19. .Serlal 110. 008,868

My inventionrelatesto fire tube boilers and has for its object to provide an improved construction whereby the etlicient circula' tion of water in the boiler canbe secured and in connection therewith to so, dispose the tubes with respect to each other that the greater part thereof can be reached by cleaning tools from the inside of the boiler.

The nature of my improvement will be best understood as described in connection with the drawings which illustrate a boiler constructed in accordance with my invention and in which Figure 1 is an end view of the boiler.

Figure 2, a section on the line 2-2 of Fig. 1, with the tubes omitted, and

Figure 3, an end view of a modified form of a boiler embodying some features of my invention.

A indicates the boiler shell which is of cylindrical form having heads indicated at B and B In the front head'B manholes C and C are formed at the top and bottom of the boiler. D is a pipe for the introduction of the water to the boiler extending, as shown, from the front of head B throughout the greater part of the length of the boiler. This pipe is open at its inner end and is further provided throughout its length with perforations indicated at D, E and E indicate two groups of boiler tubes ex tending through the boiler and separated from each other by a vertical space F. G is a curved plate set, as shown, upon the bottom of the boiler and having openings formed through its central portion as indicated at G Each group of tubes has the individual tubes set, as clearly shown in Fig. 1, so as to leave clear vertical and oblique passages between the tubes, as indicated at J, J and J The individual spacing and arrangement of the tubes is also such that the tubes are arranged in hexagonal groups surrounding the central tube, for instance, a central tube indicated at K, is surrounded by six tubes indicated at K K K, K, K and K and forming a hexagon, the spacing of the groups in the two groups E and E being also such as to leave a flared opening at the top of the vertical space F and immediately below the pipe D and directing plates, as indicated at L andL are preferably placed in this opening and inclined downward, as shown, so as arrows.

to increase the velocity of the dowwflow of the water at this point.-

In the modification shown in F ig. 3, tubes are arranged in three groups, 6, e e separated by two downwardly extending spaces f and if and provided with two water inlet pipes D, D, located one above each space within the tube groups.

In opleration, the feed water enters the boiler t rough the pipe D and issues therefrom, for the most part, through the openings D immediately above the space F which provides a free passage for the cold feed water which will, for the most part, pass directly downward, as indicated by the At the bottom of passage F the feed water will pass partly upward above the plate G, as indicated by the arrows indicating circulation, and partly downward through the openings Gr into contact with the hot bottom of the boiler from which it will ass upward, as indicated by the arrows, in contact with the outer shell of the boiler, and with the outer tubes of the tube groups. The flared space at the top of the space F, preferably provided with, guide plates L and L acts to somewhat concentrate and somewhat increase the speed of flow of the colder feed water and entrained hotter water which passes downward through the space F.

The arrangement of tubes illustrated and described is one which enables a large number of tubes to be used in the space available and also one which by leaving the clear vertical passages J and clear oblique passages J and J enables the greater part of the tubes to be reached by a cleaning tool operated from the spaces above and below the tube groups.

Having now described my invention, what I claimas new and desire to secure by Letters Patent, is:

1. In a tire tube boiler, a boiler shell having tube groups extending through it separated by a vertical space for down flow of water in combination with a feed water pi e extending horizontally through the boi er directly above the vertical space between the tube groups, said pipe having downwardly directed openings for the outflow of water throughout its length.

2. In a fire tube boiler, a boiler shell having tube groups extending through it septween the tube groups.

3. In a fire tube boiler, a shell, a plurality of spaced fire tubes extending through said shell, and man holes located above and below said tubes, said tubes being arranged to form clear vertical and oblique lanes to receive a tool introduced from positions within the boiler above and below said tubes.

4. In a fire tube boiler, a shell, a plurality of spaced fire tubes extending through said shell and arranged into groups separated by a vertical space, and manfholes located above and below said tubes, said tubes being arranged to form clear vertical and oblique lanes to receive a tool introduced from positions within the boiler above and below said tubes, in combination with a feed water pipe extending through the boiler directly above the vertical space between the tube groups and having downwardly directed openings for the outflow of water along its, length.

JOHN PETTY. 

